Steam-engine



9 9. 8 9 V. a M d e t n e t P 8 5 m" G WN 0E M WE T S 6 3 4 2 6 0 N (Application filed June 5, 1897.)

(No Model.)

I/v vE/v TUF] MWW UNITED STATES PATENT OFFICE.

JAY \V. POIVERS, OF MINNEAPOLIS,MINNESOTA, ASSIGNOR TO THE POWER DEVELOPING COMPANY, OF MINNESOTA.

STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 624,536, dated May 9, 1899.

Application filed June 5, 1897. Serial No- 639,613. (No model.) I

T on whom it may concern.-

Be it known that I, JAY W. POWERS, a citizen of the United States, residing at Min neapolis, in the county of Hennepin and State of Minnesota, have invented a new and useful Improvement in Steam-Engines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, which form a partof this specification.

My invention relates to a class of engines, wherein a piston is driven continuously in one direction, known as rotary engines;

' and the purpose of my invention is the pro- "'is equal to the diameter of the said eccentric piston and the major diameter of which is equal to twice the throw of the said eccentric piston, the said elliptical chamber being inclosed by a case the parallel heads of which form the covers of the said elliptical chamber and provide bearings for the said shaft, all of which is herein shown and hereinafter described.

In the drawings, Figure 1 is a side elevation of my improved engine; Fig. 2, an end elevation thereof; Fig. 3, a vertical longitudinal section, and Fig. 4 a vertical cross-section.

Similar letters refer to similar parts throu ghout the several views.

The shaft Ais not unlike those of other engines, and needs no description in detail. The rotary piston B consists of a short cylinder with parallel ends pierced off its center and rigidly affixed to a shaft A, thus making it an eccentric. Its parallel ends are pierced to form the steam-ports a and Z), which ports terminate in its opposite circumferential sides. The inner case 0 is suspended from the pivot c. It consists of a shaft portion d, the pivot portion a, and the head portion 6, having therein the elliptical chamber f. The depth of the elliptical chamber f is equal to the length of the eccentric piston B, the width thereof equal to the diameter of the eccentric piston B, and the length thereof equal to twice the throw of the eccentric piston B. This is an important feature of my invention, for upon the relative proportion of these parts depends the operation of my engine. Spring- 5 5 packing 9 may be employed to render the parts steam-tight; but I do not wish to confine myself to any particular form of packing. The outer case D constitutes the body or frame of my engine and may be of any desired form. It should be fashioned with a base or foot, by means of which it may be secured to its foundation or support. Its depth is equal .to that of theinner case 0, and its width sufficient to allow the inner case 0 to oscillate therein 6 5 without contacting at its sides, and its height suflicient to allow the inner case 0 to oscillate therein without contacting at its bottom. The parallel heads E and E coverthe sides of the outer case D, the inner case 0, and the ends 7o of the eccentric piston B. They are provided with the boxes or bearings h, within which the shaft A revolves, with the steam-pockets z and j, and with the ducts 7c and Z, leading to and from the pockets 2 and j. A supply-pipe 7 5 m communicates. with the duct 70, and an exhaust-pipe n communicates with the duct Z.

, The steam pockets t' and j are annular grooves surrounding the shaft A.

The operation of my engine is as follows: Live steam, being admitted through the supply-pipe m, flows through the duct is and the annular pocket 1' of the head E, through the port a of the rotary piston B, enters the elliptical chamberfof the inner case 0, expands I oscillates the inner case 0, thereby holding the opposite sides of the elliptical chamber f in constant contact therewith, and that in its rotations it alternately enters, fills, and recedes from opposite ends of the said elliptical I00 chamber f, thereby forming ateach revolution two crescent-shaped pockets 0 and 0', wherein the steam exerts its force from the elliptical Wall and against the rotary piston.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is'

"In a steam-engine, the combination of an outer case; an. oscillating case suspended therein; an elliptical chamber Within the said oscillating case; a cylindrical piston rotating Within said elliptical chamber; said piston being eccentrically mounted upon a shaft; said shaft being supported by, and revolving in the heads of the said stationary case; said heads having steam pockets, ports and pas sages adapted to convey live steam to, and exhaust-steam from the said elliptical chamber, substantially as shown and described.

JAY W. POWERS.

In presence of- W. M. TAPPAN, HENRY M. FARNAM. 

